Gawker allows you to create time-lapse movies using your iSight/DV camera. Some of its features are:

Record a time-lapse movie using your iSight/DV camera. Share your camera over the internet, broadcasting images at a specified interval (i.e. every 30 seconds). Publish your camera and browse others nearby using Bonjour. Connect to remote cameras and record their image stream into a time-lapse movie. Combine two streams to create a movie showing up to 4 locations side-by-side.